Before anyone suggests it, I am going to talk to a solicitor. I'm in the process of booking appointments etc

So to the question, any idea where I stand on trying to get out of my current situation?

My ex says she wants the house we jointly own, as she's paid more in I've agreed to that & agreed to a frankly insultingly small payout just to get out. I've found a place to move too, got the mortgage etc organised & I'm now stuck. She isn't answering any calls, texts, letters or notes through the door of where she's living (I've never seen her in to knock). So I'm here, in the house paying all the bills & mortgage since Sept & unable to leave.

Frankly it sucks to be forced to buy a house I'll never own (if that makes sense). Any ideas how I can force her to respond & get this sorted out?

Solicitors letter stating the agreement was made in September or whenever and your settlement value must increase to the value of your mortgage contributions thereafter. That would negate the suspected purpose of delaying the transaction.

Alternatively, get a Solicitors letter stating that the agreement has been reneged on by her lack of action and therefore no longer stands. You will now seek to get your entirely fair share out of the sale of the property.

Either way it's no longer going to be gentle, but you're being mugged at the moment.

I agreed to something similar, buying my ex a house for the agreed 50% of the family home, which I remortgaged and put on the market while continuing to live there myself. Result? The market dipped and I got 45k less than we had agreed to value it at. Who took the loss? Me. Did we split it? No.My advice would be not to split anything, buy new property, agree any value until it is signed, sealed, delivered and SOLD! She can continue to rent until the money is in the account. You would be safer moving to rented for the time being too. There will be other houses. Otherwise it's lose, lose for you

ETA Late to the party on this and assume it is all long since sorted, but I leave it here as a cautionary tale